Mailing List flyrotary@lancaironline.net Message #16643
From: DaveLeonard <daveleonard@cox.net>
Subject: exhaust drift
Date: Sat, 5 Feb 2005 09:25:05 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
[FlyRotary] Re: Performance coatings- bearing damage?
   I wanted to tell everyone about a phenomanom I have noticed.  My exhaust is drifting backward with the force of the airstream.  My exhaust comes straight off the turbo, down and out.  When first installed it used to butt up against the leading edge of the cowl cut-out.  I now have 90 hours.  After enlarging the aft portion of the hole twice over that time I finally accepted the fact that it is slowly drifting with the force of the slip stream.  It first I was worried about the mount or the exhaust welds, but those are holding up fine.
 
Last night I installed some springs to apply a counter force forward, then I went flying (looking for any excuse).  After just 45 min of flying the exhaust forward about 2 mm.  Once the exhaust is centered again I will adjust the tension on the springs to just counter balance the force of the slip stream.
 
The alternative would be to build a nice fairing around the exhaust, something I may eventually get to.
 
Dave Leonard
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